ak74 tm

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TM 8370-50047-IN/6

U.S. MARINE CORPS TECHNICAL MANUAL

ORGANIZATIONAL MAINTENANCE

MANUAL WITH REPAIR PARTS LIST

FOR

RIFLE, 5.45 MM, AK-74

NSN: 1005-LL-MC9-2706

P/N TBD

MARINE CORPS SYSTEMS COMMAND QUANTICO, VA 22134-6050

DISTRIBUTION STATEMENT C: DISTRIBUTION AUTHORIZED TO U.S.

GOVERNMENT AGENCIES AND THEIR CONTRACTORS. THIS PUBLICATION IS

REQUIRED FOR ADMINISTRATION AND OPERATION PURPOSES. OTHER

REQUESTS FOR THIS DOCUMENT MUST BE REFERRED TO COMMANDER,

MARINE CORPS SYSTEMS COMMAND (PG-13, PM, IW), QUANTICO, VA 22134-6050.

DESTRUCTION NOTICE: DESTROY BY ANY METHOD THAT WILL PREVENT

DISCLOSURE OF CONTENTS OR RECONSTRUCTION OF THE DOCUMENTS.

FOR OFFICIAL USE ONLY

DECEMBER

2009

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DEPARTMENT OF THE NAVY Headquarters, U.S. Marine Corps

Washington, DC 20380-0001

31 December 2009 1. This Technical Manual (TM), authenticated for Marine Corps use and effective upon receipt, provides information on the Rifle, 5.45 mm, AK-74, NSN: 1005-LL-MC9-2706; TM 8370-50047-IN/6.

2. Submit notice of discrepancies or suggested changes on NAVMC 10772. The NAVMC may be submitted via the Internet using website https://pubs.ala.usmc.mil/front.htm, scrolling down to the NAVMC 10772 Tracking Program and following instructions provided. It may also be submitted by electronic mail to [email protected], or by mailing a paper copy of NAVMC 10772 addressed to: Commanding General, Marine Corps Systems Command, Attn: Assistant Commander Acquisition and Logistics (LOG/TP), 814 Radford Blvd., Albany, Georgia 31704-0343.

BY DIRECTION OF THE COMMANDANT OF THE MARINE CORPS OFFICIAL:

MARK T. BRINKMAN Program Manager, IW, PG-13 Marine Corps Systems Command Quantico, Virginia

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A/B blank

LIST OF EFFECTIVE PAGES/WORK PACKAGES

Date of issue for original manual is: 31 December 2009.

TOTAL NUMBER OF PAGES FOR FRONT AND REAR MATTER IS 18 AND TOTAL

NUMBER OF WORK PACKAGES IS 27 CONSISTING OF THE FOLLOWING:

Page/WP No. Change No.

Front Cover ... 0 A through B ... 0 a through f ... 0 i through iv ... Chp 1 Title Page ... 0 WP 0001 00 (2 pgs.) ... 0 WP 0002 00 (4 pgs.) ... 0 WP 0003 00 (2 pgs.) ... 0 Chp 2 Title Page ... 0 WP 0004 00 (2 pgs.) ... 0 WP 0005 00 (2 pgs.) ... 0 WP 0006 00 (14 pgs.) ... 0 Chp 3 Title Page ... 0 WP 0007 00 (2 pgs.) ... 0 WP 0008 00 (14 pgs.) ... 0 WP 0009 00 (4 pgs.) ... 0 WP 0010 00 (2 pgs.) ... 0 WP 0011 00 (4 pgs.) ... 0 WP 0012 00 (6 pgs.) ... 0 WP 0013 00 (40 pgs.) ... 0 WP 0014 00 (2 pgs.) ... 0 WP 0015 00 (4 pgs.) ... 0 WP 0016 00 (2 pgs.) ... 0 WP 0017 00 (4 pgs.) ... 0 WP 0018 00 (2 pgs.) ... 0 WP 0019 00 (2 pgs.) ... 0 WP 0020 00 (2 pgs.) ... 0 WP 0021 00 (8 pgs.) ... 0 Chp 4 Title Page ... 0 WP 0022 00 (2 pgs.) ... 0 Chp 5 Title Page ... 0 WP 0023 00 (4 pgs.) ... 0 WP 0024 00 (4 pgs.) ... 0 WP 0025 00 (16 pgs.) ... 0 WP 0026 00 (4 pgs) ... 0 WP 0027 00 (16 pgs) ... 0 Index (2 pgs.) ... 0

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TM 8370-50047-IN/6

a

WARNING SUMMARY

This warning summary contains a general safety warning that must be understood and applied during operation and maintenance of this equipment. Failure to observe these precautions could result in serious injury or death to personnel.

WARNING

When using carbon removing compound, avoid skin contact. Using gloves and protective equipment is required. If carbon removing compound comes in contact with skin, wash thoroughly with running water. If possible, use a lanolin-based cream after exposure to compound. Failure to follow these warnings may cause injury or death to personnel.

WARNING

Ensure that the weapon is unloaded and that the selector lever is set on SAFE before performing the following procedures. Do not keep live ammunition near the work area. Failure to follow these warnings may cause injury or death to personnel.

WARNING

Before starting an inspection, be sure to clear the weapon. Do not pull the trigger until the weapon has been cleared. Inspect the chamber to ensure that it is empty and no ammunition is in position to be chambered. DO NOT keep live ammunition in the work area. Failure to follow these warnings may cause injury or death to personnel.

WARNING

Ensure the weapon is clear prior to performing the following function checks. If the weapon fails any of the following function checks, attempt to repair it. If the weapon is beyond repair, replace it. Failure to follow these warnings may cause injury or death to personnel.

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TM 8370-50047-IN/6

b

WARNING

Dry cleaning solvent is flammable and toxic and should be used in a well-ventilated area. The use of rubber gloves is necessary to protect the skin when washing weapon parts. Failure to follow this warning may cause injury or death to personnel.

WARNING

During general maintenance, DO NOT interchange bolt assemblies from one weapon to another without checking for the proper headspace. Refer to WP 0021 00. Failure to follow this warning may cause injury or death to personnel.

WARNING

Use only cleaner, lubricant, and preservative (CLP) for cleaning and lubrication of the AK-47 rifle in all but the most severe conditions.

Improper cleaning methods and use of unauthorized cleaning solvents may injure personnel and damage equipment. Refer to TM 9-247_, Materials

Used for Cleaning, Preserving, Abrading, and Cementing Ordnance Materials and Related Materials Including Chemicals for correct

information.

Cloths or rags saturated with solvent cleaning compound must be disposed of in accordance with authorized facilities’ procedures. Failure to follow these warnings may result in injury or death to personnel.

WARNING

Eye shields must be worn when cleaning with a wire brush. Flying rust and metal particles may cause injury to personnel.

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TM 8370-50047-IN/6

c

WARNING

Particles blown by compressed air are hazardous. Use a maximum of 30 psi when cleaning components. DO NOT exceed 15 psi nozzle pressure when drying parts with compressed air. Failure to follow these warnings may result in injury or death to personnel.

WARNING

DO NOT direct compressed air against human skin. Make sure air stream is directed away from the user and other personnel in the area. To prevent injury, the user must wear protective goggles or a face shield. Failure to follow these warnings may result in injury or death to personnel.

WARNING

Always assume that every weapon is loaded until it is determined through visual and physical inspection that it is not. Procedures for clearing and unloading the weapon are outlined in TM 8370-50047-OR/5. Failure to follow this warning may cause injury or death to personnel.

WARNING

DO NOT interchange bolt assemblies from one weapon to another without checking for the proper headspace. Failure to follow this warning may cause injury or death to personnel.

WARNING

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TM 8370-50047-IN/6

d

WARNING

If the bolt is replaced, perform head space gaging. Refer to WP 0021 00.

WARNINGS

The auto sear is under spring tension. Use care when removing or installing the auto sear.

After pushing down the lever of the auto sear, the hammer will be under spring tension. Pulling the trigger will release the hammer and it will fall forward with force.

WARNING

The hammer spring is under spring tension and the ends may be sharp enough to puncture the skin.

WARNING

The elevation slide assembly is under spring tension. Use care when working on spring-loaded parts.

WARNING

The buttplate and trapdoor are under spring tension. Use care when removing the trap door and buttplate.

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TM 8370-50047-IN/6

e

WARNING

The trap door is under spring tension. Use care when installing the trap door and buttplate.

WARNING

Ensure the weapon is clear prior to performing the following function checks. If the weapon fails any of the following function check, attempt to repair it. If the weapon is beyond repair, replace it.

WARNING

Before stowing a weapon, be sure to clear the weapon (TM 8370-50047-IN/6). Inspect the chamber to ensure it is empty and that no ammunition is in position to be chambered. Failure to follow this warning may cause injury or death to personnel.

WARNING

DO NOT store the weapon with live ammunition in either the chamber or magazine. Always assume that every weapon is loaded until it is determined through visual and physical inspection that it is not. Procedures for clearing and unloading the weapon are outlined in TM 8370-50047-OR/5. Failure to follow these warnings may cause injury or death to personnel.

WARNING

DO NOT keep live ammunition near the work area. Failure to follow this warning may cause injury or death to personnel.

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TM 8370-50047-IN/6

f

CAUTION SUMMARY

CAUTION

DO NOT use a wire brush to roughen the surfaces. Use a well-ventilated area during cleaning and the application of solid film lubricant (SFL). If SFL comes in contact with moving parts or functioning surfaces of the weapon, remove the SFL immediately by washing the area with dry cleaning solvent.

CAUTION

Do not mix multiple lubricants on the same weapon. The weapon must be cleaned thoroughly when changing from one lubricant to another. Dry cleaning solvent (SD) is recommended for removing the old lubricant before changing to another lubricant.

CAUTION

Ensure the groove in the grooved extractor retaining pin is aligned with the firing pin retaining pin hole BEFORE inserting the firing pin retaining pin. Failure to do so may cause the firing pin retaining pin to lodge in the bolt permanently.

CAUTION

Letting the hammer fall uncontrolled will damage the weapon. Ensure to place a finger over the hammer before pulling the trigger in order to ride the hammer forward.

CAUTION

Ensure that all retaining pins are fully seated in the receiver and that the long leg of the auto sear is properly installed into the retaining grooves in the heads of the retaining pins.

CAUTION

The C-clip can break and deform during installation. If the C-clip becomes bent or deformed, it should be replaced. Ensure that the open end of the C-clip is facing towards the muzzle.

CAUTION

Letting the hammer fall uncontrolled will damage the weapon. Ensure to place fingers over the hammer before pulling the trigger in order to ride the hammer forward.

CAUTION

Only moderate pressure is necessary to remove the retaining pins from the receiver. If the retaining pins are difficult to remove, check to ensure that the grooves near the end of the retaining pins are not caught on the receiver wall.

CAUTION

When pushing the bolt closed during headspace gaging, be sure to use LIGHT pressure. Failure to do so may damage the weapon.

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i

TECHNICAL MANUAL MARINE CORPS SYSTEMS COMMAND TM 8370-50047-IN/6 Quantico, VA, DECEMBER 2009

U.S. MARINE CORPS TECHNICAL MANUAL

ORGANIZATIONAL MAINTENANCE MANUAL WITH REPAIR PARTS LIST

FOR

RIFLE, 5.45 MM, AK-74

NSN: 1005-LL-MC9-2706

P/N TBD

DISTRIBUTION STATEMENT C: DISTRIBUTION AUTHORIZED TO U.S. GOVERNMENT AGENCIES AND THEIR CONTRACTORS. THIS PUBLICATION IS REQUIRED FOR ADMINISTRATION AND OPERATION PURPOSES. OTHER REQUESTS FOR THIS DOCUMENT MUST BE REFERRED TO COMMANDER, MARINE CORPS SYSTEMS COMMAND (PG-13, PM, IW), QUANTICO, VA 22134-6050. DESTRUCTION NOTICE: DESTROY BY ANY METHOD THAT WILL PREVENT DISCLOSURE OF CONTENTS OR RECONSTRUCTION OF THE DOCUMENTS.

WP/Page Number

List of Effective Pages/Work Packages ... A Warning Summary ... a Caution Summary ... f How to Use This Manual ... iii

CHAPTER 1 – GENERAL INFORMATION, EQUIPMENT DESCRIPTION AND DATA, AND PRINCIPLES OF OPERATION

General Information ... 0001 00-1 Equipment Description and Data ... 0002 00-1 Principles of Operation ... 0003 00-1

CHAPTER 2 – TROUBLESHOOTING

Troubleshooting Introduction ... 0004 00-1 Troubleshooting Symptom Index ... 0005 00-1 Troubleshooting Procedures ... 0006 00-1

CHAPTER 3 – ORGANIZATIONAL MAINTENANCE

Service Upon Receipt ... 0007 00-1 Preventive Maintenance Checks and Services (PMCS), Including Lubrication Instructions ... 0008 00-1 General Maintenance Instructions ... 0009 00-1 Disassembly of Weapon ... 0010 00-1 Bolt Carrier Assembly and Bolt Assembly ... 0011 00-1 Bolt Assembly ... 0012 00-1 Receiver Assembly ... 0013 00-1 Rear Sight Assembly ... 0014 00-1 Fixed Buttstock Assembly ... 0015 00-1 Reassembly of Weapon ... 0016 00-1 Function Check ... 0017 00-1 Stowage ... 0018 00-1 Preparation for Storage and Shipment ... 0019 00-1 Final Inspection and Function Test ... 0020 00-1 Gaging Procedures ... 0021 00-1

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TM 8370-50047-IN/6

ii

Table of Contents – Continued

WP/Page Number

CHAPTER 4 – AUXILIARY EQUIPMENT

Auxiliary Equipment - General ... 0022 00-1

CHAPTER 5 – SUPPORTING INFORMATION

References ... 0023 00-1 Expendable and Durable Items List ... 0024 00-1 Tool Identification List (Includes Special Tools) ... 0025 00-1 Repair Parts List (RPL) Introduction ... 0026 00-1 Repair Parts List (RPL) ... 0027 00-1 Index ... Index-1

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TM 8370-50047-IN/6

iii

HOW TO USE THIS MANUAL INTRODUCTION

1. This manual contains operating instructions, maintenance procedures, and troubleshooting procedures for the rifle, 5.45 mm, AK-74. It is divided into five chapters.

2. This manual is written in work package format:

a. Chapters divide the manual into major categories of information (i.e., General Information, Equipment Description and Data, and Principles of Operation).

b. Each chapter is divided into work packages, which are identified by a 6-digit number (e.g., 0001 00, 0002 00) located at the upper right-hand corner of each page. The work package page number (e.g., 0001 00-1, 0001 00-2) is centered at the bottom of each page.

c. If a change package is issued to this manual, added work packages will use the 5th and 6th digits of their numbers to indicate new material. For instance, work packages inserted between WP 0001 00 and WP 0002 00 are numbered WP 0001 01, WP 0001 02.

3. This manual should be read from beginning to end to become familiar with its organization and contents before you attempt to operate or maintain the equipment.

CONTENTS OF THIS MANUAL

1. A Warning Summary and a Caution Summary are located at the beginning of this manual. Become familiar with these warnings before operating or maintaining the equipment.

2. A Table of Contents, located in the front of this manual, lists all chapters and work packages in the publication. If you cannot find what you are looking for in the Table of Contents, refer to the alphabetical

Index at the back of the manual.

3. Chapter 1, General Information, Equipment Description and Data, and Principles of Operation, provides general information about the equipment, identifies the major components and systems, and describes how the components and systems work.

4. Chapter 2, Troubleshooting, provides symptoms and procedures pertaining to failures that could occur during operation of the AK-74.

5. Chapter 3, Organizational Maintenance, which includes Preventive Maintenance Checks and Services

(PMCS), and General Maintenance Instructions, provide procedures to maintain the AK-74 at the

organizational level.

6. Chapter 4, Auxiliary Equipment, which includes information on the equipment used with the AK-74 rifle. 7. Chapter 5, Supporting Information, provides information pertaining to references, components listing, and

an expendable and durable items list.

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TM 8370-50047-IN/6

iv

FEATURES OF THIS MANUAL

1. This manual contains information on operating and maintaining the AK-74.

2. WARNINGs, CAUTIONs, NOTEs, subject headings, and other important information are highlighted in

BOLD print as a visual aid.

WARNING

A WARNING indicates a hazard which may result in injury or death to personnel.

CAUTION

A CAUTION is a reminder of safety practices or directs attention to usage practices that may result in damage to equipment.

NOTE

A NOTE is a statement containing information that will make the procedures easier to perform.

3. Statements and words of particular interest may be printed in CAPITAL LETTERS to create emphasis. 4. Within a procedural step, reference may be made to another chapter or work package in this manual or to

another manual. These references indicate where you should look for more complete information. If you are told: “Attach the bore brush to the end of the flexible rod (WP 0014 00)”, go to WP 0014 00 in this manual for instructions.

5. Illustrations are placed after, and as close to, the procedural steps to which they apply. Callouts placed on art are text or numbers.

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TM 8370-50047-IN/6

CHAPTER 1 GENERAL INFORMATION, EQUIPMENT DESCRIPTION AND

DATA, AND PRINCIPLES OF OPERATION

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TM 8370-50047-IN/6 0001 00 GENERAL INFORMATION

0001 00-1

SCOPE

1. Type of Manual. Organizational maintenance manual for the AK-74 rifle. The basic operator’s procedures are outlined in TM 8370-50047-OR/5, Operator’s Manual with Components List for Rifle,

5.54 MM, AK-74.

2. Equipment Name and Model Number. AK-74 rifle (NSN: 1005-LL-MC9-2706).

3. Purpose of Equipment. To provide personnel with the offensive and defensive capability to engage targets with small arms fire.

MAINTENANCE FORMS, RECORDS, AND REPORTS

The Marine Corps forms and procedures used for equipment maintenance will be those prescribed by the current edition of TM 4700-15/1_, Ground Equipment Record Procedures.

CORROSION PREVENTION AND CONTROL

Corrosion prevention on any piece of equipment is important and it is critically important for the safe functioning of a weapons system. Carry out corrosion prevention and control (CPC) in accordance with TM 4795-12/1_, Organizational Corrosion Prevention and Control Procedures for USMC Equipment. While corrosion is typically associated with the rusting of metals, it can also include the deterioration of other materials such as rubber, wood, and plastic. Unusual cracking, softening, swelling, or breaking of these materials may be a corrosion problem.

DESTRUCTION INSTRUCTION TO PREVENT ENEMY USE

Follow the procedures in TM 750-244-7, Procedures for Destruction of Equipment, for the destruction of the AK-74 rifle and its variants to prevent enemy use.

PREPARATION FOR STORAGE AND SHIPMENT

1. Follow the procedures outlined in MCO P4450.7, Preparation for Storage. Prior to storing or shipping, ensure that the weapon is thoroughly cleaned as outlined in WP 0009 00.

2. Storage Procedures.

a. Ensure that the chamber and magazine are void of live ammunition.

b. Inspect the chamber and bore while applying a medium coat of cleaner, lubricant, and preservative (CLP).

c. Apply a light coat of CLP over all the weapon’s metal surfaces to provide corrosion protection and extra lubrication. Ensure that the CLP does not come into contact with any optical devices including telescopic sight pieces.

QUALITY OF MATERIAL

All material used to repair, replace, or modify the weapon must meet the requirements of this manual. If the quality of material requirements is not stated in this manual, the material must meet the requirements of the drawings, standards, specifications, or approved engineering change proposals applicable to the subject equipment.

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TM 8370-50047-IN/6 0001 00

0001 00-2

SAFETY, CARE, AND HANDLING

Read the Warning Summary and Caution Summary at the front of this manual and pay close attention to the warnings and cautions that appear where special care and attention are required. For ammunition care and handling, refer to PAM 385-64, Ammunition and Explosives Safety Standards.

LIST OF ABBREVIATIONS/ACRONYMS

Abbreviation/Acronym Definition

be ... Bale bk ... Book bt ... Bottle CAGEC ... Commercial and Government Entity Code CLP ... Cleaner, Lubricant, and Preservative CPC ...Corrosion Prevention and Control dz ... Dozen ea ... Each fps ... Feet per Second in. ... Inch LAW ... Lubricant, Arctic, Weapons LSA ... Lubricant, Semi-Fluid, Automatic Weapons m ... Meter mL ... Milliliter mm ... Millimeter N/A ... Not Applicable NSN ... National Stock Number pkg ... Package PMCS ... Preventive Maintenance Checks and Services psi ... Pounds per Square Inch pt ... Pint rds/min ... Rounds per Minute ROD ... Report of Discrepancy RPL ... Repair Parts List SD ... Dry Cleaning Solvent SFL ... Solid Film Lubricant SMR ... Source, Maintenance and Recoverability SSRI ... Supply System Responsibility Items U/M ... Unit of Measure VCI ... Volatile Corrosion Inhibitor

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TM 8370-50047-IN/6 0002 00 EQUIPMENT DESCRIPTION AND DATA

0002 00-1

DESCRIPTION

1. General. The AK-74 rifle is a 5.45 x 39 mm, lightweight, air-cooled, gas-operated, magazine-fed, shoulder-fired weapon which can be selectively fired on the semi-automatic or full automatic settings. 2. Capabilities. Provides personnel the offensive and defensive capability to engage targets with direct

small arms fire.

3. Differences Between Models. The AK-74 rifle can have a fixed or threaded muzzle. The muzzle can have a thread protector or compensator. The AK-74 can have a fixed, side folding, or under folding buttstock. The handguards and buttstock can be made of metal or plastic. The country of origin can be identified by the selector markings or manufacturers’ markings on the right side of the receiver. Refer to Tables 2 and 3.

4. Left Side. The left side view of the weapon displays the muzzle, barrel, gas tube, top cover, magazine release, and pistol grip. Refer to Figure 1.

Figure 1. Left Side of the AK-74 Rifle.

5. Right Side. The right side view of the weapon displays the buttstock, guide rod spring lock, trigger, selector lever, charging handle, rear sight, front sight, sling, and bayonet. Refer to Figure 2.

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TM 8370-50047-IN/6 0002 00

0002 00-2

LOCATION AND DESCRIPTION OF MAJOR COMPONENTS

Refer to Figure 3.

1. Receiver and Barrel Assembly. The receiver and barrel assembly includes the front sight assembly, gas block, gas tube, upper and lower handguards, rear sight assembly, auto sear, auto sear spring, hammer assembly, magazine release, selector lever, trigger assembly, pistol grip, and buttstock.

2. Top Cover. The top cover covers and protects the mechanisms housed in the receiver.

3. Recoil Spring and Guide Rod Assembly. The recoil spring and guide rod assembly returns the bolt carrier group to the locked position during the counter-recoil cycle.

4. Bolt Carrier Assembly and Bolt Assembly. The bolt carrier assembly includes the charging handle, gas piston, bolt carrier, and houses the bolt assembly, which includes the bolt, grooved extractor retaining pin, extractor, extractor spring, firing pin retaining pin, and firing pin. It carries out the cycle of operation. 5. Magazine. The magazine can be metal or plastic, can hold 30 rounds, and is inserted into the receiver through the magazine well. It is held in place by the magazine catch. The forward motion of the bolt carrier group strips the cartridge from the magazine and feeds it into the chamber.

6. Cleaning Rod. The cleaning rod is used to conduct preventive maintenance.

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TM 8370-50047-IN/6 0002 00

0002 00-3

EQUIPMENT DATA

Table 1. AK-74 Rifle Equipment Data.

AK-74 Rifle Equipment Data

Caliber: 5.45 x 39 mm

Total Weight: Weapon Empty

w/Loaded 30 rd Magazine Approx. 7.9 lbs. Approx. 8.6 lbs

Length:

Fixed Buttstock/Buttstock-Extended Approx. 34.2 inches

Buttstock Folded Approx. 27.5 inches

Rifling: 4 grooves, right-hand twist

1 turn in 8 inches

Sights:

Front Adjustable sight post for elevation

Adjustable drum for windage

Rear Leaf sight for elevation

Magazine Capacity: 30 rounds

Modes of Fire: Semi-automatic

Fully automatic

Maximum Effective Range:

Semi-automatic Approx. 400 m

Rate of Fire (cyclic): Approx. 650 rds/min

Muzzle Velocity: Approx. 2953 fps

Table 2. Selector Lever Markings.

Upper or Full Auto Symbol Lower or Semi Auto Symbol Producer

AB EA Bulgaria China/PRC L D China/PRC 30 1 Czechoslovakia D E East Germany D E Egypt Finland 1 Hungary L D Iran Iraq North Korea C P Poland FA FF Romania AB or AV OA or O Russia R J Yugoslavia

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TM 8370-50047-IN/6 0002 00

0002 00-4

Table 3. Manufacturer’s Markings.

Marking Producer Marking Producer Marking Producer

Bulgaria East Germany

(Suhl Factory) Russia (Izhevsk

Factory)

Bulgaria East Germany

(Ernst Thaelmann Factory) Bulgaria Egypt China/PRC (Polytec) Iraq

China/PRC North Korea

China/PRC Poland

China/PRC Romania

China/PRC Russia

China/PRC

(Norinco) Russia (Izhevsk Factory)

China/PRC Russia (Polyany

Arsenal)

East Germany Russia (Tula

Arsenal)

East Germany Russia (Tula

Arsenal)

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TM 8370-50047-IN/6 0003 00

PRINCIPLES OF OPERATION

0003 00-1

GENERAL

The 5.45 mm AK-74 rifle: 1. Is gas-operated.

2. Fires in either the semi-automatic (SEMI) or fully automatic (AUTO) mode.

3. Has positive locking of the bolt. The firing pin is part of the bolt assembly and cannot strike the primer until the bolt assembly is fully locked.

CYCLE OF OPERATION

The cycle of operation is similar in all small arms. Knowledge of what happens during the cycle of operation will help both the operator and the maintainer understand the cause of and remedy for various stoppages.

NOTE

The cycle of operation begins at any of the following eight steps. 1. Eight Steps. The cycle of operation contains eight steps:

a. Feeding b. Chambering c. Locking d. Firing e. Unlocking f. Extracting g. Ejecting h. Cocking.

2. Description of Eight Steps. The eight steps of the cycle of operation are explained below, along with a brief description of what occurs inside the rifle during each step. Assume that a full magazine is loaded into the weapon.

a. Feeding. The magazine follower, under spring tension, feeds the top cartridge into the path of the bolt. As the bolt, held in the bolt carrier, is pushed forward by the recoil spring, the bottom of the bolt passes over the lips of the magazine, strips the top cartridge from the magazine, and pushes it into the chamber.

b. Chambering. Chambering is complete when the cartridge is fully seated in the chamber and the extractor is engaged in the extraction groove at the base of the cartridge.

Dirt or debris inside the chamber, or bent, dented, or otherwise faulty ammunition can prevent a cartridge from fully chambering or extracting.

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TM 8370-50047-IN/6 0003 00

0003 00-2

c. Locking. The face of the bolt strikes the rear extension of the barrel and its forward movement is stopped. As the bolt carrier continues forward, the cam recess in the bolt carrier acts on the cam on the bolt causing the bolt to rotate. As the bolt rotates, the locking lugs on the head of the bolt engage the locking recesses in the receiver. Locking is then complete.

d. Firing. When the trigger is pulled, the trigger hook(s) disengage from the hammer. The tension of the hammer spring pushes the hammer to rotate up and forward until it strikes the rear of the firing pin. The firing pin is pushed forward through the face of the bolt and strikes the primer of the round, which ignites the propellant in the cartridge. The expanding gases resulting from this explosion propel the bullet forward through the barrel.

e. Unlocking. As the round passes through the barrel and past the gas block, some of the gas (under high pressure) expands into the gas tube. This gas pushes the gas piston, which is attached to the bolt carrier, to the rear. As the bolt carrier is pushed to the rear, the cam recess in the bolt carrier acts on the cam on the bolt, causing the bolt to rotate. As the bolt rotates, the locking lugs on the head of the bolt disengage from the locking recesses in the receiver. Unlocking is then complete.

f. Extracting. The bolt carrier, holding the bolt, continues to move to the rear under pressure from the expanding gas. As the bolt moves to the rear, the bolt extractor holds the base of the cartridge against the bolt face. Extraction is complete when the front of the empty cartridge case clears the rear of the chamber.

g. Ejecting. As the bolt moves to the rear, the empty cartridge case is held by the extractor. The base of the cartridge strikes the fixed ejector located on the interior of the receiver. The extractor serves as a pivot point for the cartridge, which is deflected out of the ejection opening of the receiver.

h. Cocking. As the bolt moves to the rear, the bottom of the bolt carrier rides over the hammer. This forces the hammer to rotate down and to the rear until it is engaged by the disconnector (if firing on SEMI) or auto sear (if firing on AUTO). When the trigger is released, the trigger hooks engage the hammer, holding it down and to the rear.

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TM 8370-50047-IN/6

CHAPTER 2 TROUBLESHOOTING

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TM 8370-50047-IN/6 0004 00

TROUBLESHOOTING INTRODUCTION

0004 00-1/2 blank

GENERAL

This section contains troubleshooting information for locating and correcting malfunctions that may occur with the AK-74 rifle.

The Troubleshooting Symptom Index (WP 0005 00) is a quick reference aid in troubleshooting the weapon. Table 1 in Troubleshooting Procedures (WP 0006 00) lists possible malfunctions, tests, or inspections, and corrective actions taken for troubleshooting the AK-74 rifle at the organizational level. Perform the tests, inspections, and corrective actions in the order shown in the table, except when the malfunction and cause are obvious. This manual cannot list all of the possible malfunctions, tests or inspections, and corrective actions of the AK-74 rifle.

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TM 8370-50047-IN/6 0005 00

TROUBLESHOOTING SYMPTOM INDEX

0005 00-1/2 blank

INTRODUCTION

Refer to Table 1 in Troubleshooting Procedures (WP 0006 00) for malfunctions, tests or inspections, and corrective actions. The symptom index below is a quick reference of the malfunctions that are covered in the table.

Malfunction/Symptom Troubleshooting Procedure Page

1. Failure of Magazine to Lock in Weapon ... 0006 00-1 2. Failure to Feed ... 0006 00-2 3. Failure to Chamber ... 0006 00-2 4. Failure to Lock ... 0006 00-3 5. Failure to Fire ... 0006 00-6 6. Failure to Unlock ... 0006 00-7 7. Failure to Extract ... 0006 00-8 8. Failure to Eject ... 0006 00-8 9. Failure to Cock ... 0006 00-9 10. Short Recoil ... 0006 00-10 11. Rifle Cannot be Zeroed ... 0006 00-11 12. Failure to Cycle with Selector Lever on AUTO ... 0006 00-12 13. Weapon Fires with Selector Lever on SAFE or when Trigger is Released with

Selector Lever on SEMI ... 0006 00-12 14. Auto Sear Pin “Walks” ... 0006 00-13 15. Hammer Pin “Walks” ... 0006 00-13 16. Trigger Pin “Walks” ... 0006 00-14 17. Runaway Gun ... 0006 00-14

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TM 8370-50047-IN/6 0006 00 TROUBLESHOOTING PROCEDURES

0006 00-1

GENERAL

Table 1 lists the possible malfunctions, tests or inspections, and corrective actions to be taken for troubleshooting the AK-74 rifle. All malfunctions are at the organizational level.

Table 1. Troubleshooting Procedures.

Malfunction Test or Inspection Corrective Action 1. Failure of magazine to lock

in the weapon. a. Defective magazine. Replace the magazine.

b. Magazine release is dirty, corroded, or has no spring tension. Refer to Figure 1.

Clean the magazine release. Attempt to repair the magazine release or replace the weapon.

c. Bent magazine well. Replace the weapon.

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TM 8370-50047-IN/6 0006 00

0006 00-2

Table 1. Troubleshooting Procedures - Continued.

Malfunction Test or Inspection Corrective Action

2. Failure to feed. a. Dirty or corroded magazine. Disassemble and clean the

magazine. Refer to TM 8370-50047-OR/5.

b. Short recoil. Refer to Short Recoil in this table

(# 10).

3. Failure to chamber. a. Weak, deformed, or broken

recoil spring and guide rod assembly. Refer to Figure 2.

Replace the recoil spring and guide rod assembly. Refer to WP 0010 00.

(# 10).

(35)

TM 8370-50047-IN/6 0006 00

0006 00-3

4. Failure to lock. a. Chamber is dirty, burred, or

has an obstruction.

Clean the chamber. Remove any burrs. Remove the obstruction. b. Burred, dirty, or damaged bolt.

Refer to Figure 3. Clean the bolt. Remove any burrs. Replace the bolt if necessary. Refer to WP 0012 00.

Figure 3. Opposite Views of the Bolt.

c. Improperly assembled

extractor assembly. Refer to Figure 4.

Assemble the extractor assembly correctly. Refer to WP 0012 00.

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TM 8370-50047-IN/6 0006 00

0006 00-4

4. Failure to lock - Cont. d. Defective gas tube. Refer to

Figure 5. Replace the gas tube. Refer to WP 0010 00.

NOTE

Pits or holes in the gas tube may be caused by ammunition which is corrosive due to old age or poor manufacture.

Figure 5. Gas Tube in Handguard.

e. Weak or broken recoil spring and guide rod assembly. Refer to Figure 6.

Replace the recoil spring and guide rod assembly. Refer to WP 0010 00.

(37)

TM 8370-50047-IN/6 0006 00

0006 00-5

4. Failure to lock - Cont. f. Bolt carrier assembly (gas

piston and bolt carrier) is dirty, burred, or damaged Refer to Figure 7.

Clean bolt carrier assembly. Remove any burrs. Replace if necessary. Refer to WP 0011 00.

(38)

TM 8370-50047-IN/6 0006 00

0006 00-6

5. Failure to fire. a. Carbon buildup in bolt

assembly. Disassemble and clean the bolt assembly. Refer to WP 0012 00. b. Firing pin retaining pin

incorrectly installed. Correctly install the firing pin retaining pin. Refer to WP 0012 00. c. Broken, defective, or missing

firing pin retaining pin. Refer to Figure 8.

Replace the firing pin retaining pin. Refer to WP 0012 00.

Figure 8. Firing Pin Retaining Pin.

d. The firing pin is incorrectly

installed. Correctly install the firing pin. Refer to WP 0012 00. e. Broken or chipped firing pin.

Refer to Figure 9. Replace the firing pin. Refer to WP 0012 00.

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TM 8370-50047-IN/6 0006 00

0006 00-7

5. Failure to fire - Cont. f. Improperly assembled

weapon. Assemble the weapon correctly. Refer to TM 8370-50047-OR/5, WP 0011 00, WP 0012 00, and WP 0013 00.

g. Broken hammer or hammer spring.

Replace the hammer or hammer spring. Refer to WP 0013 00.

h. Hammer/trigger improperly

assembled. Assemble the hammer/trigger correctly. Refer to WP 0013 00.

i. Hammer spring improperly

installed. Install the hammer spring correctly. Refer to WP 0013 00.

6. Failure to unlock. a. Burred bolt assembly. Remove burrs or replace the bolt

assembly. Refer to WP 0012 00. b. Burred bolt carrier assembly

(gas piston and bolt carrier). Refer to Figure 10.

Remove burrs or replace the bolt carrier assembly. Refer to WP 0011 00.

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TM 8370-50047-IN/6 0006 00

0006 00-8

7. Failure to extract. a. Defective extractor retaining

pin, extractor, and/or extractor spring. Refer to Figure 11.

Replace the extractor retaining pin, extractor, and/or extractor spring. Refer to WP 0012 00.

b. A cartridge is lodged in the barrel due to bad ammunition or barrel erosion.

Remove the cartridge. Check the quality of ammunition. Gage the barrel to check for erosion. Replace the weapon if necessary. Refer to WP 0021 00

c. Short recoil. Refer to Short Recoil in this table

(# 10).

Figure 11. Extractor Spring, Extractor Retaining Pin, and Extractor.

8. Failure to eject. a. Defective cartridge ejector.

Refer to Figure 12. Attempt to repair. Replace the weapon if necessary.

(# 10).

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TM 8370-50047-IN/6 0006 00

0006 00-9

9. Failure to cock. a. Short recoil. Refer to Short Recoil in this table

(# 10). b. Worn or broken hammer

spring. Refer to Figure 13.

Replace hammer spring. Refer to WP 0013 00.

c. Worn or broken trigger. Replace the trigger. Refer to

WP 0013 00.

d. Worn or broken hammer. Replace the hammer. Refer to

WP 0013 00.

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TM 8370-50047-IN/6 0006 00

0006 00-10

10. Short recoil. a. Defective recoil spring and

guide rod assembly. Replace the recoil spring and guide rod assembly. Refer to WP 0010 00. b. Dirty gas block, gas tube,

recoil spring and guide rod assembly, or bolt carrier assembly (gas piston and bolt carrier).

Clean and lubricate with CLP. Refer to WP 0010 00 and WP 0013 00.

c. Excessive gas leakage caused by defective gas tube or gas block. Pitting due to use of corrosive ammunition

Replace the gas tube. If the gas block is defective, replace the weapon. Refer to

TM 8370-50047-OR/5.

d. Weak or broken gas piston. Replace the bolt carrier assembly.

Refer to WP 0010 00. e. Gas selector is in the wrong

position.

Rotate the gas selector. Refer to WP 0013 00.

WARNING

When using carbon removing compound, wearing gloves and protective equipment is required. Avoid contact with skin. If carbon removing compound comes in contact with skin, wash thoroughly with running water, and apply a lanolin-based cream, if possible. Failure to follow this warning may cause injury or death to personnel.

f. Carbon build-up in barrel/gas block.

Remove carbon build-up by soaking the barrel in carbon removing compound.

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TM 8370-50047-IN/6 0006 00

0006 00-11

11. Rifle cannot be zeroed. a. Defective front sight post.

Refer to Figure 15.

Remove the front sight post. If damaged, replace. Refer to WP 0013 00.

Figure 15. Front Sight Assembly.

b. Defective or bent barrel. Replace the weapon.

c. For elevation: defective rear sight. Refer to Figure 16.

Repair the rear sight as required. Refer to WP 0013 00.

d. For elevation: improperly assembled rear sight. Refer to Figure 16

Properly assemble the rear sight. Refer to WP 0013 00 and

WP 0014 00.

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TM 8370-50047-IN/6 0006 00

0006 00-12

Malfunction Test or Inspection Corrective Action 12. Failure to cycle with selector

lever set on AUTO. a. Broken or worn auto sear or auto sear spring. Refer to Figure 17.

Replace the auto sear or auto sear spring. Refer to WP 0013 00.

Figure 17. Auto Sear and Auto Sear Spring.

b. Defective selector lever. Refer

to Figure 18. Replace the selector lever. Refer to WP 0013 00.

c. Short recoil. Refer to Short Recoil in this table

(# 10). 13. Weapon fires with selector

lever on SAFE or when trigger is released with selector lever on SEMI.

a. Defective selector lever. Refer

to Figure 18. Replace the selector lever. Refer to WP 0013 00.

b. Worn or broken trigger. Replace the trigger. Refer to

WP 0013 00.

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TM 8370-50047-IN/6 0006 00

0006 00-13

Malfunction Test or Inspection Corrective Action 14. Auto sear retaining pin

“walks” or works loose during firing, or auto sear retaining pin is very easy to push out of receiver.

a. Worn or broken auto sear retaining pin or auto sear spring. Refer to Figure 19.

Replace the auto sear retaining pin or the auto sear spring. Refer to

WP 0013 00. b. Long leg of auto sear spring

set incorrectly into groove in the auto sear retaining groove.

Install the long leg of the auto sear spring correctly. Refer to WP 0013 00.

Figure 19. Auto Sear Retaining Pin and Auto Sear Spring.

15. Hammer retaining pin “walks” or works loose during firing, or hammer retaining pin is very easy to push out of receiver.

a. Worn or broken hammer retaining pin or auto sear spring. Refer to Figure 20.

Replace the hammer retaining pin or auto sear spring. Refer to WP 0013 00.

b. Long leg of auto sear spring set incorrectly into hammer

retaining pin groove.

Install the long leg of the auto sear spring correctly. Refer to

WP 0013 00.

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TM 8370-50047-IN/6 0006 00

0006 00-14

Malfunction Test or Inspection Corrective Action 16. Trigger retaining pin “walks”

or works loose during firing, or trigger retaining pin is very easy to push out of receiver.

a. Worn or broken trigger retaining pin or auto sear spring. Refer to Figure 21.

Replace the trigger retaining pin or auto sear spring. Refer to

WP 0013 00. b. Long leg of auto sear spring

set incorrectly into trigger retaining pin groove.

Install the long leg of the auto sear spring correctly. Refer to

WP 0013 00.

Figure 21. Trigger Retaining Pin and Auto Sear Spring.

17. Runaway gun. a. Defective auto sear. Refer to

Figure 22. Replace the auto sear. Refer to WP 0013 00.

b. Worn or defective disconnector. Refer to Figure 22.

Replace the disconnector. Refer to WP 0013 00.

c. Defective hammer or the top of hammer is worn. Refer to Figure 22.

Replace the hammer. Refer to WP 0013 00.

Figure 22. Auto Sear, Disconnector, and Hammer.

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TM 8370-50047-IN/6

CHAPTER 3

(48)

(49)

TM 8370-50047-IN/6 0007 00

SERVICE UPON RECEIPT

0007 00-1/2 blank

GENERAL

1. Inspect the weapon for damage incurred during shipment. If the weapon has been damaged, report the damage on form SF 364, Report of Discrepancy (ROD).

2. Check the weapon against the packing slip to see if the shipment is complete. 3. Check to see if the weapon has been modified.

4. Check the weapon for damage upon its receipt. Perform limited technical inspection as outlined in Table 1 of this work package.

Table 1. Service Upon Receipt.

Location Item Action Remarks

Container 1. AK-74 a. Remove weapon from

containers.

b. Inspect the weapon for damage incurred during shipment.

If the weapon has been damaged, report damage on SF 364.

c. Check the weapon against the

packing list to see if the shipment is complete. Report all discrepancies. 2. Supply system responsibility items (SSRI)

Check for missing items. Refer to

TM 8370-50047-OR/5. 3. Barrel assembly If volatile corrosion inhibitor (VCI) is

in the barrel, remove and discard.

AK-74 rifle 1. All parts a. Field-strip the weapon and

inspect for missing, damaged, and rusted or corroded parts.

Refer to

TM 8370-50047-OR/5.

b. Clean and lubricate Refer to

TM 8370-50047-OR/5.

c. Reassemble. Refer to

TM 8370-50047-OR/5.

d. Function check. Refer to WP 0017 00.

e. Check to see if the weapon has been modified.

Report all modifications.

f. Conduct initial gaging. Refer to WP 0021 00

2. Magazine Check for positive retention of

magazine.

Refer to

TM 8370-50047-OR/5.

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(51)

TM 8370-50047-IN/6 0008 00 PREVENTIVE MAINTENANCE CHECKS AND SERVICES (PMCS), INCLUDING LUBRICATION

INSTRUCTIONS

0008 00-1

GENERAL

This work package contains procedures and instructions necessary to perform organizational preventive maintenance checks and services (PMCS), along with disassembly and reassembly procedures required for corrective maintenance for the AK-74 rifle.

1. Organizational Maintenance. Organizational maintenance is performed at the using unit beyond the capabilities of the operator as identified in TM 8370-50047-OR/5. Organizational maintenance is

authorized to service, replace, and adjust the parts and assemblies covered in the organizational portion of this manual.

2. Intermediate through Depot Maintenance. This is not applicable to this platform. All maintenance is performed at the organizational level or the weapon is replaced.

3. Special Tools; Test, Measuring, and Diagnostic Equipment (TMDE); and Support Equipment. Special tools and TMDE required for support are listed in WP 0025 00. There are no fabricated tools for this weapon.

4. Repair Parts. Repair parts are listed and illustrated in WP 0027 00.

WARNING

Ensure that the weapon is unloaded and that the selector lever is set on SAFE before performing the following procedures. Do not keep live ammunition near the work area. Failure to follow these warnings may cause injury or death to personnel.

NOTES

PMCS is to be performed every 90 days to keep the weapon ready for use. If the weapon has not been used for 90 days, PMCS described in the operator’s manual (TM 8370-50047-OR/5) should also be performed.

Solid film lubricant (SFL) is authorized to be used as a touch up for the exterior protective finish on the AK-74.

5. General. The PMCS procedures are contained in the following table. They are arranged in logical sequence requiring a minimum amount of time and motion on the part of the persons performing them and are arranged so that there will be minimum interference between the persons performing

simultaneous checks on the same end item.

6. Item Number Column. This column describes checks and services numbered in disassembly sequence. 7. Interval Column. This column states the designated interval when each check is to be performed. 8. Item to Check/Service Column. This column lists the items to be checked or serviced.

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TM 8370-50047-IN/6 0008 00

0008 00-2

9. Procedure Column. This column contains a brief description of the procedure by which the check is to be performed. It contains all the information required to accomplish the checks and services.

10. Not Fully Mission Capable If Column. This column states which faults will prevent the weapon from being capable of performing its primary mission. The weapon should not be used if it meets any of the faults listed in this column.

11. Other Table Entries. Observe all WARNINGs, CAUTIONs, and NOTEs.

Table 1. Preventive Maintenance Checks and Services for the AK-74 Rifle.

Item

No. Interval Location or Item to Check/Service Procedure Not Fully Mission Capable if:

WARNING

Before starting an inspection, be sure to clear the weapon. Do not pull the trigger until the weapon has been cleared. Inspect the chamber to ensure that it is empty and no ammunition is in position to be chambered. DO NOT keep live ammunition in the work area. Failure to follow these warnings may cause injury or death to personnel.

NOTES

An inactive weapon is a weapon that has been stored in an arms room for a period of 90 days without use. Inactive weapons should receive quarterly PMCS unless inspection reveals more frequent servicing is necessary.

If the unit armorer detects corrosion on a weapon prior to the end of the 90 day period, the PMCS should be performed immediately.

(53)

TM 8370-50047-IN/6 0008 00

0008 00-3

Table 1. Preventive Maintenance Checks and Services for the AK-74 Rifle - Continued.

Item

1 Quarterly Magazine

(Serviceability Check) a. Disassemble. Refer to TM 8370-50047-OR/5. Inspect the magazine body for bulges, dents, or damaged feeder lips. Inspect the spring and follower for bends, kinks, or damage. Replace the magazine if any of these conditions exist. Refer to Figure 1.

A magazine is not available for use with the rifle.

b. Reassemble the magazine and check for binding when

depressing and releasing the follower. Replace the magazine if the follower binds. Refer to Figure 1.

(1) The body is dented or feeder lips on top of the body are damaged. The spring is damaged or has flat spots. (2) The follower binds.

(54)

TM 8370-50047-IN/6 0008 00

0008 00-4

Item

2 Quarterly Selector Lever,

Function Check

WARNING

Ensure the weapon is clear prior to performing the following function checks. If the weapon fails any of the following function checks, attempt to repair. If beyond repair, replace the weapon.

Selector Lever

- SEMI a. Pull and hold the charging handle to the rear. Check that the chamber is clear. Let the bolt carrier close forward. Refer to Figure 2.

The bolt does not lock forward.

b. Leave the hammer in the cocked position. Do not pull the trigger.

- SAFE a. Place the selector lever in SAFE

position.

b. Pull the trigger. The hammer

should not fall. The hammer falls.

- SEMI a. Place the selector lever in SEMI _position.

b. Pull the trigger and hold it to the

rear. The hammer falls. The hammer does not fall.

(55)

TM 8370-50047-IN/6 0008 00

0008 00-5

Item

No. Interval Location or Item to Check/Service Procedure Not Fully Mission Capable if: 2

Cont. Quarterly Selector Lever NOTES

For the purpose of the following test, SLOW is defined as 1/4 to 1/2 the normal rate of trigger release.

DO NOT milk the trigger. Milking the trigger can cause the hammer to fall.

-SEMI c. Hold the trigger to the rear, _{charge the weapon, and release} the trigger with a SLOW, smooth motion, without hesitations or stops, until the trigger is fully forward (an audible click should be heard). The hammer should not fall. (The hammer should not fall until the trigger is pulled again.)

The hammer falls.

- AUTO a. Place the selector lever on _{AUTO. Charge the weapon. Pull} the trigger and hold it to the rear. The hammer should fall. Refer to Figure 3.

The hammer does not fall.

b. Holding the trigger to the rear, charge the weapon and release the trigger. Pull the trigger a second time. The hammer should not fall. (The hammer should have been released by the auto sear when the weapon was charged.)

The hammer falls when the trigger is pulled the second time.

(56)

TM 8370-50047-IN/6 0008 00

0008 00-6

Item

No. Interval Location or Item to Check/Service Procedure Not Fully Mission Capable if: 2

Cont. Quarterly Selector Lever -AUTO With the hammer in the forward position, using moderate finger/thumb pressure, attempt to place the

selector lever on the SAFE position. Refer to Figure 4.

Moderate finger/thumb pressure does NOT move the selector lever to the SAFE position.

(57)

TM 8370-50047-IN/6 0008 00

0008 00-7

Item

3 Quarterly Receiver Assembly a. Apply a light coat of CLP to all

metal parts. Remove any rust, dirt, or debris. Remove any burrs. Lubricate all moving parts. Remove excess lubricant. Refer to WP 0009 00.

b. Hand check the thread protector (if present) or compensator (if present) for looseness on the barrel, then hand check the barrel for looseness on the receiver. Refer to Figure 5.

The compensator, thread protector, or barrel is loose.

Figure 5. Thread Protector and Compensator.

c. Check the gas selector, gas block, and rear sight assembly for damage and functionality.

The gas selector, gas block, or rear sight assembly is unserviceable or damaged.

(58)

TM 8370-50047-IN/6 0008 00

0008 00-8

Item

No. Interval Location Check/Service or Item to Procedure Not Fully Mission Capable if: 3

Cont. Quarterly Receiver Assembly d. Remove the lower handguard and the upper handguard and gas tube. Refer to TM

8370-50047-OR/5. Inspect the handguards internally and externally for cracks and damage. Refer to Figure 6.

The handguards are missing or defective.

e. Cracks are acceptable providing they do not extend into the front or rear of the handguards or adversely affect the weapon’s operation, operator safety, or proper retention of the handguard. Refer to Figure 6. f. Check the gas tube for

deformities or holes. Remove carbon deposits or debris. Refer to Figure 6.

The gas tube has

deformities, holes, carbon deposits, or debris.

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TM 8370-50047-IN/6 0008 00

0008 00-9

Item

No. Interval Location or Item to Check/Service Procedure Not Fully Mission Capable If: 3

Cont. Quarterly Receiver Assembly g. Inspect the pistol grip screw and pistol grip for defects or looseness on the receiver.

The pistol grip is defective or loose. h. Check the magazine release for

magazine retention. The magazine release will not retain a magazine.

i. Check the fixed buttstock (if present) for defects. A total of three cracks are acceptable. However, cracks near critical areas (near pins or screws) are not acceptable. Refer to Figure 7.

The fixed buttstock has more than three cracks or any cracks near critical areas.

Figure 7. Fixed Buttstock.

j. Check the fixed buttstock (if present) for looseness on the receiver. If it is loose, remove the screws, clean the threads, apply thread-locker, and reinstall the screws. If necessary, replace the buttstock screws or buttstock.

The fixed buttstock is loose.

k. Check the folding buttstock (if present) for cracks and bends. Ensure it will fold and extend. Ensure it will lock in both

positions. Lubricate all joints and moving parts.

The folding buttstock is damaged, will not fold and extend, or lock in both positions.

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TM 8370-50047-IN/6 0008 00

0008 00-10

Item

No. Interval Location Check/Service or Item to Procedure Not Fully Mission Capable If: 3

Cont. Quarterly Receiver Assembly l. Raise and lower the rear sight assembly. The rear sight leaf spring should retain the rear sight assembly in both positions with firmness.

The rear sight leaf spring will not retain the rear sight assembly in either position

m. Check the front sight base, post, locking detent, and detent spring for damage or corrosion. Clean and lubricate the parts. Refer to Figure 8.

The front sight base, post, locking detent, or detent spring are damaged or corroded.

NOTE

If the front or rear sight is moved, return it to its original position.

n. Check the sling swivel that is located on the left side of the gas block for damage and proper function.

The sling swivel is defective.

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TM 8370-50047-IN/6 0008 00

0008 00-11

Item

No. Interval Location or Item to Check/Service Procedure Not Fully Mission Capable If: 3

Cont. Quarterly Receiver Assembly

WARNING

Dry cleaning solvent is flammable and toxic and should be used in a well-ventilated area. The use of rubber gloves is necessary to protect the skin when washing weapon parts. Failure to follow this warning may cause injury or death to personnel.

CAUTION

DO NOT use a wire brush to roughen the surfaces. Use a well-ventilated area during cleaning and the application of solid film lubricant (SFL). If SFL comes in contact with moving parts or functioning surfaces of the weapon, remove the SFL immediately by washing the area with dry cleaning solvent.

NOTE

Shiny metal exterior surfaces of the weapon should be recoated with SFL. Clean the surface with dry cleaning solvent, dry, roughen with abrasive cloth, and apply solid film lubricant.

o. Inspect the receiver finish for scratches or worn, shiny spots. p. If scratched or worn shiny spots

are present, disassemble the receiver assembly and remove all lubricant from the surface with dry cleaning solvent.

q. Wear chemical and oil protective gloves and use a wash pan (tote box) to apply the solvent. Let the parts dry thoroughly. Roughen the surface using abrasive cloth and apply SFL. Allow 16 to 24 hours drying time before handling.

(62)

TM 8370-50047-IN/6 0008 00

0008 00-12

Item

No. Interval Location or Item to Check/Service Procedure Not Fully Mission Capable If:

4 Quarterly Bolt Carrier Assembly

WARNING

During general maintenance, DO NOT interchange bolt assemblies from one weapon to another without checking for the proper headspace. Refer to WP 0021 00. Failure to follow this warning may cause injury or death to personnel.

a. Disassemble (WP 0011 00 and WP 0012 00) and inspect the bolt carrier assembly and bolt

assembly for defects. Refer to Figure 8.

The bolt carrier assembly or bolt assembly are defective.

b. Check the bolt for an elongated or cracked firing pin hole. If the firing pin hole is elongated or cracked, replace the bolt. Refer to Figure 8.

The firing pin hole is elongated or cracked.

c. Check for a broken or missing firing pin retaining pin. Replace the pin if necessary. Refer to Figure 8.

There is a missing or broken firing pin retaining pin.

d. Check the cartridge extractor and extractor spring for defects and serviceability. If the cartridge extractor or extractor spring are dirty, clean, lubricate, and

assemble them. Replace them as necessary. Refer to Figure 8.

The parts are missing or unserviceable.

e. Check the bolt carrier assembly (bolt carrier and gas piston) for defects. Replace the bolt carrier if necessary. Refer to Figure 8.

The bolt carrier assembly is damaged.

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TM 8370-50047-IN/6 0008 00

0008 00-13

Item

No. Interval Location and Item to Check/Service Procedure Not Fully Mission Capable If: 4

Cont Bolt Carrier Assembly and Bolt Assembly f. Check the firing pin for defects. If the firing pin is damaged, replace it. Refer to Figure 8.

The firing pin is damaged.

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TM 8370-50047-IN/6 0008 00

0008 00-14

Item

No. Interval Location _{Item to} Check/Service

Procedure Not Fully Mission Capable if:

5 Quarterly Recoil Spring and

Guide Rod Assembly

Check the recoil spring and guide rod assembly for straightness, spring tension, and defects. Replace if necessary. Refer to Figure 9.

The recoil spring or guide rod has weak spring tension, is bent, or defective.

Figure 9. Recoil Spring and Guide Rod Assembly.

6 Quarterly Top Cover Check the top cover for dents.

Replace the top cover if dented. Refer to Figure 10.

The top cover is dented.

Figure 10. Top Cover.

(65)

TM 8370-50047-IN/6 0009 00 GENERAL MAINTENANCE INSTRUCTIONS

0009 00-1

THIS WORK PACKAGE DESCRIBES

Scope, Work Safety, General Information, Cleaning Instructions, Inspection Instructions, Repair Instructions, Lubrication Instructions, Standard Tool Requirements, Applying Torque, and Tagging Instructions.

INITIAL SETUP Maintenance Level Organizational References TM 4795-12/1_ TM 9-247_ WP 0008 00 SCOPE

The following general maintenance instructions contain the general shop practices and specific methods used to properly maintain the AK-74 rifle.

WORK SAFETY

1. Before beginning the following tasks, ensure safety by wearing protective gear such as safety goggles or lenses, safety shoes, rubber apron, and gloves.

2. Observe all WARNINGs, CAUTIONs, and NOTEs.

GENERAL INFORMATION

Before beginning a task, determine how much repair, modification, or replacement is needed to repair the weapon as described in this manual. Occasionally, the cause of equipment failure is apparent and complete disassembly of the weapon is unnecessary. Should disassembly be necessary, only disassemble the weapon so far as necessary to repair or replace the broken parts.

CLEANING INSTRUCTIONS

WARNINGS

Use only cleaner, lubricant, and preservative (CLP) for cleaning and lubrication of the AK-74 rifle in all but the most severe conditions.

Improper cleaning methods and use of unauthorized cleaning solvents may injure personnel and damage equipment. Refer to TM 9-247_, Materials

Used for Cleaning, Preserving, Abrading, and Cementing Ordnance Materials and Related Materials Including Chemicals for correct

information.

Cloths or rags saturated with solvent cleaning compound must be disposed of in accordance with authorized facilities’ procedures.

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TM 8370-50047-IN/6 0009 00

0009 00-2

WARNINGS - CONTINUED

Eye shields must be worn when cleaning with a wire brush. Flying rust and metal particles may cause injury to personnel.

Particles blown by compressed air are hazardous. Use a maximum of 30 psi when cleaning components. DO NOT exceed 15 psi nozzle pressure when drying parts with compressed air.

DO NOT direct compressed air against human skin. Make sure air stream is directed away from the user and other personnel in the area. To prevent injury, the user must wear protective goggles or a face shield.

Failure to follow these warnings may result in injury or death to personnel.

CAUTIONS

Do not mix multiple lubricants on the same weapon. The weapon must be cleaned thoroughly when changing from one lubricant to another. Dry cleaning solvent (SD) is recommended for removing the old lubricant before changing to another lubricant.

DO NOT allow CLP or any other solvent to come in contact with telecopic sight lenses or other optical devices.

NOTE

When the term lubricant or CLP is used in the following text, the lubricant used can be either CLP, lubricating oil, semi-fluid, automatic weapons (LSA), or lubricant, arctic, weapons (LAW). Cloths or rags saturated with CLP must be disposed of in accordance with authorized facilities’ procedures. Cleaning instructions are the same for the majority of the parts and components of the weapon.

Maintenance personnel must thoroughly understand the importance of cleaning. Great attention to detail is required for cleaning the weapon. Dirt, dust, foreign material, and grit are a constant threat to satisfactory performance of the weapon. Thorough cleaning ensures high weapon performance. The following should apply to all cleaning, inspection, repair, and assembly operations.

1. Cleaning All Parts.

a. Clean all parts before inspection, after repair, and before assembly.

b. To prevent contamination, hands should be kept free of any accumulation of grease that can collect dust, dirt, or grit.

c. After cleaning, all parts should be covered or wrapped to protect them from dust and dirt. Parts that are subject to rust should be oiled lightly.